Home / 20,111.20-30,170.40-8,425.60

Finding the Fourth Proportional to 20,111.20, 30,170.40 and 8,425.60

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Solution

The fourth proportional to 20,111.20, 30,170.40 and 8,425.60 is: 12,639.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,111.20 : 30,170.40 = 8,425.60 : x
  2. Step 2: Convert to fraction form
    20,111.20/30,170.40 = 8,425.60/x
  3. Step 3: Cross multiply
    20,111.20x = 30,170.40 × 8,425.60
  4. Step 4: Simplify right side
    20,111.20x = 254,203,722.24
  5. Step 5: Solve for x
    x = 254,203,722.24/20,111.20
  6. Step 6: Final answer
    x = 12,639.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.